Neumann U473 Power problem

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timtom

Well-known member
Joined
Apr 27, 2016
Messages
139
Location
Berlin, Germany
One of my Neumann U473 compressors stopped working.
I checked the voltages and the normal 20v are only around 3v.
I recapped it but still the same problem.
T10 (2n6125) gets hot when plugged to 24V.

Is there a way to check with part of the power supply is causing that problem?
 

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I desoldered T10 and checked it with a multimeter. It has a short between E and C. As the 2n6125 is obsolete, which transistor is a good replacement? Any experiences?

 

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I replaced the T10 (2n6125) with a TIP 32C and replaced 2 more tantalum caps connected to the power rails and the second pcb and it works again.Thanks for all the help.
 

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